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Science 9 > Chapter 15— Electricity > Flashcards

Chapter 15— Electricity Flashcards

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1
Q

Electricity that flows in only one direction

A

DC ( Direct current )

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2
Q

Electricity that flows one way, then another

A

AC ( Alternating current )

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3
Q

Devices that convert AC to DC

A

Rectifiers

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4
Q

The “force” with which an electric current flows

A

Voltage

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5
Q

An instrument to measure voltage

A

Voltmeter

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6
Q

The rate of the charge “flow”

A

Current

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7
Q

SI unit of voltage

A

Volt

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8
Q

SI unit of current

A

Ampere

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9
Q

Energy used per unit time

A

Power

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10
Q

SI unit of power

A

Watt

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11
Q

What does P=VI mean?

A

Power equals voltage times current

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12
Q

Companies charge electricity by watt unit? 😀

A

Kilowatt-hours

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13
Q

What materials easily conduct electricity?

A

Conductors

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14
Q

What materials do not easily conduct electricity?

A

Insulators

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15
Q

The amount a certain object hinders electron flow is what?

A

Resistance

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16
Q

What is resistance measured in?

A

Ohms (Ω)

17
Q

What instrument is used to measure resistance?

A

Ohmmeter

18
Q

What sort of heat is produced when electrons have to overcome “electrical friction”?

A

Joule heat

19
Q

What is the most important factor affecting the ease of current flow?

A

Type O’ Material

20
Q

True or false: The thinner the wire, the easier electricity can flow.

A

False; the thicker wire has less resistance

21
Q

True or false: The longer a wire, the more resistance.

A

True!

22
Q

True or false: If you decided one day to increase the temperature of your wire, you would have just made it harder on yourself; since now there is more resistance.

A

True!!!

23
Q

A material that allows current to flow through it with no resistance at all or at least imperceptible amounts

A

Superconductor

24
Q

At what temperature does a material become a superconductor?

A

The critical temperature

25
Q

The current flowing through a conductor is directly proportional to the voltage and inversely proportional to the resistance

A

Ohm’s Law

26
Q

Ohms law is……..

A

V= IR

27
Q

What is a special device made to increase resistance?

A

Resistor

28
Q

The flow of electrons or other charged particles from one place to another

A

Current electricity

Science 9 (7 decks)

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